Muffler with frusto-conical baffle and removably disposed perforated extension tube



1951 w. D. STOREY 70,728 MUFFLER WITH FRUSTO-CONICAL BAFFLE ANDREMOVABLY DISPOSED PERFORATED EXTENSION TUBE Filed Nov. 29, 1948Inventor Attorneys Patented Oct. 9, 1951 UNITED STATES PAT MUFFLER WITHFRUSTO-CONICAL RAFFLE AND REMOVABLY -DISPOSED PERFO- RATED EXTENSIONTUBE 2 Claims. 1

This invention appertains to novel and useful improvements inattachments for motorcycles.

The primary purpose of the present invention is to provide means wherebyan acceptable and lawful motorcycle muffler can be altered with littleeffort and become an open exhaust with the muffler feature eliminatedand which can then be quickly reassembled with little effort and againused as a standard mufller.

Another object of this invention is to support an extension pipe havinga frusto-conical bafile thereon, at the end of a conventional exhaustpipe or exhaust pipes of a motorcycle engine.

Another object of this invention is to provide an extremely simplifieddevice of the character to be described which may be used for thepurpose of complying of certain regulations requiring mufflers and whichis attractive and appealing to the eye.

Ancillary objects and features of novelty will become apparent to thoseskilled in the art, in following the description of the preferred formof the invention, illustrated in the accompanying drawings, wherein:

Figure 1 is a perspective view of the preferred form of the invention;

Figure 2 is a longitudinal sectional view taken substantially on theline 2-2 of Figure 1 and in the direction of the arrows, and;

Figure 3 is a sectional View taken substantially on the line 3-3 ofFigure 2 and in the direction of the arrows.

In general motorcycles are supplied with exhaust pipes. Some motorcyclesuse one while others use two and others may even use a greater number.For illustrative purposes one of the exhaust pipes seen at I3 issupplied and has a removable extension tube In fitted in the borethereof.

Motorcycle riders are required to have an acceptable muffier in citiesand restricted areas, but when motorcycles are on cross-country trips orin race competition, riders desire and prefer a muffler that may bereadily and easily adjusted or transformed to an open exhaust ratherthan to continue to operate with a mufiler. The chief reason for this isthat the engine operates cooler and functions more satisfactorily athigh speeds. The specific structure and operation is as follows:

A frusto-conical baflle I6 is attached at its upper end I8 to theexhaust pipe l3 by any suitable means such as welding, brazing,soldering or the like.

A number of perforations [2 are supplied adiacent the exhaust end of theremovable extension tube It! to permit egress of exhaust gases. The endof the tube 10 adjacent the perforations is supplied with a closure disc30 having a central opening (unnumbered) with conventional threadstherein. By this construction it is apparent that the exhaust gases mustescape through the perforations I2.

The frusto-conical bafile has at its enlarged end a number of brackets20. It is noted that these brackets may be substituted by a singleperipheral flange if it is felt desirable. In each construction however,there is a number of threaded openings or apertures supplied foraccommodation of screws 22.

The said screws 22 penetrate an end plate 24 which also has a number ofapertures 26 of any size and shape, as desired. This end plate attachesto the disc 30 through the medium of the central screw 28.

In operation the device may be changed from a muffler mechanism to anopen exhaust for a motorcycle in two Ways. The first is by removal ofboth the removable extension tube l0 and the end plate 24. The second isby the removal of the removable extension tube l 0 and the replacementof the end plate 24.

It is noted that there are at least three adjustments of the device, onebeing illustrated in Figure 2. The second is as shown in Figure 2 withthe extension tube Ill removed and the third is as shown in Figure 2 butin the absence of tube 10 and plate 24.

By the above described structure not only is there an attractive devicesupplied but also, it is contemplated by the present invention to changethe tone of the exhaust by the utility of more or less apertures 26, bythe actual absence of removable extension tube It) and end plate 24, orby substituting different end plates of different sizes and shapes.

It is apparent that certain variations may be made without departingfrom the spirit of the invention. Accordingly, limitation is sought onlyin accordance with the scope of the following claims.

Having described the invention, what is claimed as new is:

1. In a vehicle having at least one exhaust pipe, a muffler comprising afrusto-conical bafile having a narrow open end and a relatively wideopen end, the narrow open end abutting and secured to the exhaust pipe,an extension tube removably disposed at one end in the bore of saidexhaust pipe and being perforated adjacent the opposite end, anapertured closure attached to the wider end of said frusto-conicalb'aiiie and the perforated end of said removably disposed extensiontube, the actual end of the latter bein plugged with a closure disc, andto which end said apertured closure is centrally attached, thussupporting said tube.

2. An attachment for a vehicle which includes an exhaust pipe extendingfrom an engine comprising a tapered bafile open at opposite ends andattached at one end to the exhaust pipe thereby forming a flaredextension of the exhaust pipe, a removably disposed tube in the bore ofsaid exhaust pipe and disposed axially within said baflie, said tubehaving openings therein and a substantially closed end and adapted todampen engine sound When the tube is present in the bore of said exhaustpipe, an apertured closure detachably secured to the opposite end ofsaid baflie and said tube, and said closure and said tube beingremovable from said bafile and exhaust pipe to form an open exhaust.

WILLIAM D. STOREY REFERENCES CITED The following references are ofrecord in the file of this patenti UNITED STATES PATENTS

